BUT... although most of time stereotypes can be fairly accurate, there are many cases where stereotypes are dead wrong. Like wronger than wrong. ESPECIALLY when it comes to people.
Within the LGBT community, stereotypes can cause a lot of confusion. Most people assume gay men and women look, dress and act a certain way. Many also assume that in order to be Transgender, you must dress and act like the gender that you identify with.
Now you may be thinking, "But if they identify as a dude/chick shouldn't they dress and act like a dude/chick?" and I would have to tell you "Nah fam. They don't have to do anything"
Being transgender is much more complex than just getting surgery and dressing a different way and going by a different name.
Stereotypes generalize things and when you're trying to generalize something so complex, you can get really confused. Especially when it comes to lesbian and gay stereotypes.
What kind of person comes to mind when you hear the term "Lesbian"? Most think of a woman that dresses and acts very masculine... Like this:

But that isn't always the case. Literally ANYONE could be a lesbian. Come up with as many stereotypes as you want to, I guarantee you that I can find someone that contradicts every stereotype you think of.
And same goes for gay men. Many think of a very feminine man... maybe you thought of someone like this...
...that may like make-up and shopping but honestly, that's just another stereotype. That really buff guy you and your friend saw at the gym the other day? Yeah, he's gay.
You can be taught all sorts of stereotypes for all sorts of different people, some stereotypes may be spot on for certain people. Just keep in mind that you may also come across someone that contradicts everything you thought you knew.
So you know... keep an open mind